I would like to explore the storage data of a contract. I have geth fully synched and I interact with it over RPC. There is the function "eth.getStorageAt(addr, index, block)" provided, but you need ...

I want to run two separate nodes on my computer but it seems that the two nodes will collide with other. I know some considerations should be taken such as the ports, but anything else should I take ...

My goal: To simulate the Ethereum blockchain with different clients. So, they create their own accounts, i.e. public/private keys, and store them locally. So all are for testing.
Assume, I have set ...

When I deploy a contract from node.js using the web3 JavaScript API (connected to a locally running geth), and then check the deployed bytecode using eth.getCode(address) (either from the JS console ...

I'm a bit puzzled about the ethereum.org/token example which states further down in the advanced examples that it can be coupled to proof-of-work. I really like the idea of mining a token. The example ...

I would like to reliably induce a fork on a private testnet so that I can test the behavior of off-blockchain code that interacts with contracts. (see related questions as to why I would want to do ...

Is there any way of just unlocking accounts without opening the console with geth?
I'm writing some scripts to automate cluster generation and I wish I could just call geth to unlocking some accounts ...

The variance of block times should arguably follow a Poisson distribution. But by casual observation I've seen blocks fast as 4 s or 1 m 15 s. The average is around 14 s since Homestead.
If it follows ...

I tried the "deposit with BTC" option
BTC transfer was recognized in "Awaiting Deposit"
Then "Awaiting Exchange" timed out, I got a "try again" dialog, and was shown no way to get my BTC back or to ...

I know Ethereum is more advanced, and allows for more interesting things than associating data to a transaction. But let's say I have a legacy system that uses Bitcoin's OP_RETURN. What options do I ...

I am facing the following problem with my ether.li wallet, I never had Problems in the past with sending transactions but for the last two days transactions stopped working for me. Whenever I try to ...

I know that this has been covered in other questions here but I'm not sure what's happening in my case. My code is returning a compiler error "Stack too deep, try removing local variables." But I only ...

I'm wanting to set up a charity and want to use a public wallet for accepting donations with on Etherscan where I can have a displayed name next to the wallet like this:
How Can I Add My Name Next To ...

The DAO token holders that split away from the main The DAO into a child DAO will have moved the tokens (DAO) and the corresponding ethers (ETH) into the child DAO.
As these DAO token holders have a ...

Currently running geth 1.8 on Ubuntu 17.10 on an SSD. Anytime I start geth, it will always sync until it hits the last 65 blocks where it just hangs and looks like it stays stuck at downloading the ...

As I understand it, smart contracts are currently immortal by default. Does this mean that I could create a contract that happened to contain an encoded form of baby photos and have it stored forever? ...

Ethereum clients (such as geth, eth, pyethapp, ethereumj, and ethereumH) download the Ethereum blockchain from their peers and then store a copy of it locally, presumably indexed within some sort of ...

I sent some amount of ETH to a wallet. I checked the wallets balance on ether chain. I entered the address in the search field and noticed both lowercase and uppercase versions of the address seemed ...

I'm trying to create and deploy a smart contract through NodeJS using web3, but it is not working as I get a "web3.eth.contract.new is not a function". Here is my code:
var web3 = require('ethereum....

I'm testing Ethereum with a complex contract which requires quite a lot of gas. And I'm testing (and will be running) a private network with controlled miners, so I don't need them getting any reward, ...

I'm running geth on Linux within a Chromebook. The blockchain is being stored within ~/.ethereum, along with other important files. Problem is, the storage capacity on my Chromebook is quite limited ...

I'm trying to figure out how to use the delegatecall method on a contract address in a contract to call a function in a separate contract.
I know Libraries are the higher level interface to use but I ...

So today, A vulnerability found within the Parity walletLibrary which resulted in freezings of potentially hundreds of millions of dollars from wallets using parity multi-sig.
Can someone technically ...